DOIO KB30 Refactor (#21250)

* refactor keymaps

- remove extra blank lines
- convert tabs to spaces
- use four-space indent
- grid-align keycodes
- use QMK-native keycode aliases

* info.json: correct layout data

* add readme.md

* info.json: correct maintainer field

Updates the value to reference the maintainer's GitHub username.

keyboards/doio/kb30/readme.md

@@ -0,0 +1,27 @@
+# Megalodon DOIO 30% Designer Keyboard
+
+![Megalodon DOIO 30% Designer Keyboard](https://raw.githubusercontent.com/noroadsleft/qmk_images/master/keyboards/doio/kb30/KB30-01-_0000_778b3a43-228a-433d-94ae-9129f20b2ede_1024xc.jpg)
+
+A hotswappable 30-key macropad with 3 rotary encoders (2 are clickable), an OLED screen, and RGB lighting.
+
+* Keyboard Maintainer: [DOIO2022](https://github.com/DOIO2022)
+* Hardware Supported: Megalodon DOIO 30% Designer Keyboard with STM32F103
+* Hardware Availability: [KeebMonkey](https://www.keebmonkey.com/products/megalodon-doio-30-designer-keyboard)
+
+Make example for this keyboard (after setting up your build environment):
+
+    make doio/kb30:default
+
+## Accessing Bootloader Mode and Flashing
+
+To access Bootloader Mode, do one of the following:
+
+* **Bootmagic reset**: Hold the top left key of the keyboard while connecting the USB cable.
+* **Physical reset button**: Briefly press the button on the back of the PCB - some may have pads you must short instead.
+* **Keycode in layout**: Press the key mapped to `QK_BOOT` if it is available.
+
+Flashing example for this keyboard:
+
+    make doio/kb30:default:flash
+
+See the [build environment setup](https://docs.qmk.fm/#/getting_started_build_tools) and the [make instructions](https://docs.qmk.fm/#/getting_started_make_guide) for more information. Brand new to QMK? Start with our [Complete Newbs Guide](https://docs.qmk.fm/#/newbs).